ipq40xx: add Edgecore ECW5211 support

ipq40xx: add Edgecore ECW5211 support

This patch adds support for the Edgecore ECW5211 indoor AP.

Specification:
- SoC: Qualcomm Atheros IPQ4018 ARMv7-A 4x Cortex A-7
- RAM: 256MB DDR3
- NOR Flash: 16MB SPI NOR
- NAND Flash: 128MB MX35LFxGE4AB SPI-NAND
- Ethernet: 2 x 1G via Q8075 PHY connected to ethernet adapter via PSGMII (802.3af POE IN on eth0)
- USB: 1 x USB 3.0 SuperSpeed
- WLAN: Built-in IPQ4018 (2x2 802.11bng, 2x2 802.11 acn)
- CC2540 BLE connected to USB 2.0 port
- Atmel AT97SC3205T I2C TPM

Signed-off-by: Robert Marko <robert.marko@sartura.hr>